U.S. patent application number 16/629270 was filed with the patent office on 2020-05-21 for glass-plastic hybrid lens assembly.
The applicant listed for this patent is JIANGXI LIANCHUANG ELECTRONIC CO., LTD.. Invention is credited to Yumin Bao, Xuming Liu, Hongbin Peng, Zhuo Wang, Jiyong Zeng.
Application Number | 20200158912 16/629270 |
Document ID | / |
Family ID | 63350638 |
Filed Date | 2020-05-21 |
United States Patent
Application |
20200158912 |
Kind Code |
A1 |
Wang; Zhuo ; et al. |
May 21, 2020 |
GLASS-PLASTIC HYBRID LENS ASSEMBLY
Abstract
Provided in the present disclosure is a glass-plastic hybrid
lens assembly. The glass-plastic hybrid lens assembly comprises a
glass lens and at least one plastic lens from an object side to an
image side of the glass-plastic hybrid lens assembly in turn; and
an ultraviolet cutoff layer, in which the ultraviolet cutoff layer
is disposed at a side of the plastic lens away from the image side,
and the ultraviolet cutoff layer is disposed spaced from the
plastic lens. The glass-plastic hybrid lens assembly is simple and
easy to be realized; the ultraviolet cutoff layer can effectively
absorb or reflect the ultraviolet irradiation on the glass-plastic
hybrid lens assembly, thereby preventing subsequent plastic lenses
from ultraviolet irradiation effectively and solving demoulding and
yellowing phenomena of plastic lenses occurring under strong UV
irradiation effectively, thus effectively improving the UV
resistance and solar-irradiance resistance of the glass-plastic
hybrid lens assembly. Further, the glass-plastic hybrid lens
assembly can effectively achieve athermalization at a low cost by
combining a glass lens with a plastic lens.
Inventors: |
Wang; Zhuo; (Nanchang,
CN) ; Peng; Hongbin; (Nanchang, CN) ; Bao;
Yumin; (Nanchang, CN) ; Liu; Xuming;
(Nanchang, CN) ; Zeng; Jiyong; (Nanchang,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
JIANGXI LIANCHUANG ELECTRONIC CO., LTD. |
Nanchang |
|
CN |
|
|
Family ID: |
63350638 |
Appl. No.: |
16/629270 |
Filed: |
April 30, 2019 |
PCT Filed: |
April 30, 2019 |
PCT NO: |
PCT/CN2019/085182 |
371 Date: |
January 7, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 1/041 20130101;
G02B 3/00 20130101; G02B 5/208 20130101; G02B 1/11 20130101; G02B
1/14 20150115; G02B 13/18 20130101 |
International
Class: |
G02B 1/04 20060101
G02B001/04; G02B 5/20 20060101 G02B005/20; G02B 1/11 20060101
G02B001/11; G02B 1/14 20060101 G02B001/14; G02B 13/18 20060101
G02B013/18 |
Foreign Application Data
Date |
Code |
Application Number |
May 22, 2018 |
CN |
201810493960.4 |
Claims
1. A glass-plastic hybrid lens assembly comprising: a glass lens
and at least one plastic lens from an object side to an image side
of the glass-plastic hybrid lens assembly in turn, and an
ultraviolet cutoff layer, wherein the ultraviolet cutoff layer is
disposed at a side of the plastic lens away from the image side,
and the ultraviolet cutoff layer is disposed spaced from the
plastic lens.
2. The glass-plastic hybrid lens assembly according to claim 1,
wherein the glass lens is made of a material capable of absorbing
ultraviolet ray, and the glass lens is multiplexed into the
ultraviolet cutoff layer.
3. The glass-plastic hybrid lens assembly according to claim 1,
wherein the ultraviolet cutoff layer is disposed at a first surface
of the glass lens facing the object side or disposed at a second
surface of the glass lens facing the image side.
4. The glass-plastic hybrid lens assembly according to claim 1,
wherein the glass-plastic hybrid lens assembly further comprises an
anti-reflection firm, wherein the anti-reflection firm is disposed
at a first surface of the glass lens facing the object side or
disposed at a second surface of the glass lens facing the image
side.
5. The glass-plastic hybrid lens assembly according to claim 4,
wherein one of the ultraviolet cutoff layer and the anti-reflection
film is disposed at the first surface of the glass lens facing the
object side, and the other of the ultraviolet cutoff layer and the
anti-reflection film is disposed at the second surface of the glass
lens facing the image side.
6. The glass-plastic hybrid lens assembly according to claim 1,
wherein the ultraviolet cutoff layer is selected from an
ultraviolet cutoff film and an ultraviolet-infrared cutoff
film.
7. The glass-plastic hybrid lens assembly according to claim 6,
wherein the ultraviolet cutoff film or the ultraviolet-infrared
cutoff film has an anti-reflection effect on visible lights.
8. The glass-plastic hybrid lens assembly according to claim 2,
wherein the glass lens has an average thickness not less than 0.8
mm and has a light absorption at a wavelength of 360 nm not less
than 20%.
9. The glass-plastic hybrid lens assembly according to claim 2,
wherein the material forming the glass lens is flint glass.
10. The glass-plastic hybrid lens assembly according to claim 2,
wherein the glass lens is capable of absorbing both ultraviolet
rays and lights at a wavelength between 400 nm and 500 nm.
11. The glass-plastic hybrid lens assembly according to claim 1,
wherein the glass lens is a spherical glass lens or a flat glass
lens.
12. The glass-plastic hybrid lens assembly according to claim 1,
wherein the glass lens is an aspheric glass lens.
13. The glass-plastic hybrid lens assembly according to claim 1,
wherein the glass-plastic hybrid lens assembly further comprises a
waterproof film, an anti-scratch film or a waterproof-antiscratch
film, wherein the waterproof film, the anti-scratch film or the
waterproof-antiscratch film is disposed at a side of the glass lens
close to the object side and is disposed close to an object.
14. The glass-plastic hybrid lens assembly according to claim 1,
wherein the glass-plastic hybrid lens assembly further comprises a
lens barrel, and wherein the glass lens, the plastic lens and the
ultraviolet cutoff layer are all disposed in the lens barrel, and
at least a portion of the outer surface of the lens barrel is
provided with an ultraviolet reflective film or an ultraviolet
absorbing film.
15. The glass-plastic hybrid lens assembly according to claim 1,
wherein the glass-plastic hybrid lens assembly is a vehicle-mounted
lens.
16. A vehicle, comprising a glass-plastic hybrid lens assembly,
wherein the glass-plastic hybrid lens assembly comprises: a glass
lens and at least one plastic lens from an object side to an image
side of the glass-plastic hybrid lens assembly in turn, and an
ultraviolet cutoff layer, wherein the ultraviolet cutoff layer is
disposed at a side of the plastic lens away from the image side,
and the ultraviolet cutoff layer is disposed spaced from the
plastic lens.
17. The vehicle according to claim 16, wherein the glass lens is
made of a material capable of absorbing ultraviolet ray, and the
glass lens is multiplexed into the ultraviolet cutoff layer.
18. The vehicle according to claim 16, wherein the ultraviolet
cutoff layer is disposed at a first surface of the glass lens
facing the object side or disposed at a second surface of the glass
lens facing the image side.
19. The vehicle according to claim 16, wherein the glass-plastic
hybrid lens assembly further comprises an anti-reflection firm,
wherein the anti-reflection firm is disposed at a first surface of
the glass lens facing the object side or disposed at a second
surface of the glass lens facing the image side.
20. The glass-plastic hybrid lens assembly according to claim 9,
wherein the glass lens is capable of absorbing both ultraviolet
rays and lights at a wavelength between 400 nm and 500 nm.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a US National Phase application based
upon PCT Application No. PCT/CN2019/085182 filed with the National
Intellectual Property Administration of P. R. China on Apr. 30,
2019, which claims priority to Chinese Patent Application No.
201810493960.4 filed May 22, 2018, the entire content of which are
incorporated herein by reference.
FIELD
[0002] The present disclosure relates to optical components, in
particular to a glass-plastic hybrid lens assembly.
BACKGROUND
[0003] Advanced driver assistance system (ADAS), incorporating
various advanced sensor components and artificial intelligence, has
developed into the focus of most attention in recent years. A
typical ADAS comprises two parts, specifically peripheral sensor
devices (such as a camera, laser radar, an ultrasonic detector and
the like) and a central processor which processes the fused
information of the sensor device and then gives forewarning. The
peripheral sensor devices, such as lenses, with great advantages of
cheapness and large information, have been widely applied in the
ADAS by combining with the current artificial intelligence and
machine learning.
[0004] For the existing lens design, achieving athermalization
within a broad temperature range (such as -40.degree. C. to
+85.degree. C. or even +105.degree. C.) is challenging. A lens
assembly having glass lens and plastic lens is usually used so as
to realize athermalization. However, the plastic lens has a severe
problem of poor thermal stability in high and low temperature
environment and poor ultraviolet (UV) resistance. Specifically, a
plastic material has a thermal expansion coefficient about ten
times larger than that of a glass material, resulting in poor
thermal stability; the anti-reflection film and the black
light-absorbing ink coated on the surface of the plastic lens may
occur demoulding under high temperature, high humidity and
temperature cycles, thus affecting the imaging quality
significantly; and the plastic lenses or even plastic lens barrels
will appear demoulding and yellowing phenomena under strong UV
irradiation. Such potential problems have severely affected the
wide application of the lens assembly having the glass lens and the
plastic lens.
SUMMARY
[0005] Embodiments of the present disclosure seek to solve at least
one of the problems existing in the related art. Accordingly, an
object of the present disclosure is to provide a glass-plastic
hybrid lens assembly with excellent thermal stability and
ultraviolet resistance. The glass-plastic hybrid lens assembly
provided has great imaging quality and a long service life.
[0006] In an aspect of the present disclosure, provided in
embodiments is a glass-plastic hybrid lens assembly. According to
some embodiments of the present disclosure, the glass-plastic
hybrid lens assembly comprises a glass lens and at least one
plastic lens from an object side to an image side of the
glass-plastic hybrid lens assembly in turn, and an ultraviolet
cutoff layer, wherein the ultraviolet cutoff layer is disposed at a
side of the plastic lens away from the image side, and the
ultraviolet cutoff layer is disposed spaced from the plastic lens.
The glass-plastic hybrid lens assembly of the present disclosure is
simple and easy to be realized. The ultraviolet cutoff layer can
effectively absorb or reflect the ultraviolet irradiation on the
glass-plastic hybrid lens assembly, thereby preventing subsequent
plastic lenses from ultraviolet irradiation effectively and solving
demoulding and yellowing phenomena of plastic lenses occurring
under strong UV irradiation effectively, thus effectively improving
the UV resistance and solar-irradiance resistance of the
glass-plastic hybrid lens assembly. Further, the glass-plastic
hybrid lens assembly can effectively achieve athermalization at a
low cost by combining the glass lens with the plastic lens.
[0007] According to some embodiments of the present disclosure, the
glass lens is made of a glass material capable of absorbing
ultraviolet ray, and the glass lens is multiplexed into the
ultraviolet cutoff layer. Therefore, the glass lens simultaneously
exhibits functions of light transmission and ultraviolet
absorption, thus lowering the preparation cost.
[0008] According to some embodiments of the present disclosure, the
ultraviolet cutoff layer is disposed at a first surface of the
glass lens facing the object side or disposed at a second surface
of the glass lens facing the image side. Therefore, the structure
is simple and easy to be realized; the ultraviolet cutoff layer
exhibits strong adhesion when coated on the surface of the glass
lens and can effectively absorb the ultraviolet lights, thus
avoiding ultraviolet irradiation to subsequent plastic lenses, with
a long service life.
[0009] According to some embodiments of the present disclosure, the
glass-plastic hybrid lens assembly further comprises an
anti-reflection firm, wherein the anti-reflection firm is disposed
at a first surface of the glass lens facing the object side or
disposed at a second surface of the glass lens facing the image
side, thereby increasing the transmittance of visible lights,
improving the sharpness and contrast of lens imaging and obtaining
high imaging quality.
[0010] According to some embodiments of the present disclosure, one
of the ultraviolet cutoff layer and the anti-reflection film is
disposed at the first surface of the glass lens facing the object
side, and the other of the ultraviolet cutoff layer and the
anti-reflection film is disposed at the second surface of the glass
lens facing the image side. Therefore, the preparation process is
convenient and at a low cost. The ultraviolet cutoff layer and the
anti-reflection film each can fully exert their respective
functions without mutual interference. According to an embodiment
of the present disclosure, the anti-reflection film has a thickness
of 100 nm to 800 nm. Therefore, the transmittance of visible lights
can be greatly improved and the lens imaging exhibits better
sharpness and contrast effects. According to an embodiment of the
present disclosure, the ultraviolet cutoff layer is selected from
an ultraviolet cutoff film and an ultraviolet-infrared cutoff film.
Therefore, the ultraviolet cutoff film or the ultraviolet-infrared
cutoff film has a better effect on reflecting ultraviolet rays. The
ultraviolet-infrared cutoff film can also effectively reflect
infrared rays, thus improving the control to stray lights and
effectively avoiding the generation of halos, with improved imaging
quality and greater use performance.
[0011] According to some embodiments of the present disclosure, the
ultraviolet cutoff film or the ultraviolet-infrared cutoff film has
an anti-reflection effect on visible-lights. Therefore, the
ultraviolet cutoff film or the ultraviolet-infrared cutoff film can
not only respectively prevent ultraviolet radiation or infrared
radiation from entering the glass-plastic hybrid lens assembly, but
also effectively increase the transmittance of visible lights (400
nm to 700 nm), thereby improving the imaging quality. In the
firm-system design, three options can be selected. Specifically, in
the first option, two surfaces of the glass lens are respectively
coated with the ultraviolet cutoff film and the anti-reflection
film, such that one surface with the ultraviolet cutoff film can
exhibit effects of ultraviolet cutoff and visible-light
anti-reflection, and the other surface with the anti-reflection
film can exhibit visible-light anti-reflection effect; in the
second option, two surfaces of the glass lens are respectively
coated with the ultraviolet-infrared cutoff film and the
anti-reflection film, such that one surface with the
ultraviolet-infrared cutoff film can exhibit effects of ultraviolet
and infrared cutoff and visible-light anti-reflection, and the
other surface with the anti-reflection film can exhibit
visible-light anti-reflection effect; and in the third option, two
surfaces of the glass lens are respectively coated with the
ultraviolet cutoff film and the infrared cutoff film, such that one
surface with the ultraviolet cutoff film can exhibit effects of
ultraviolet cutoff and visible-light anti-reflection, and the other
surface with the infrared cutoff film can exhibit effects of
infrared cutoff and visible-light anti-reflection. The specific
arrangement of the two surfaces of the glass lens is not limited.
Any of the anti-reflection film, the ultraviolet cutoff film and
the ultraviolet-infrared cutoff film facing the object side is
within the scope of the present disclosure. According to an
embodiment of the present disclosure, the ultraviolet cutoff film
has a thickness of 1000 nm to 5000 nm and the ultraviolet-infrared
cutoff film has a thickness of 3000 nm to 9000 nm, thus the
ultraviolet cutoff film and the ultraviolet-infrared cutoff film
have a better effect on reflecting ultraviolet rays or infrared
rays, with greater use performance. According to an embodiment of
the present disclosure, the glass lens has an average thickness not
less than 0.8 mm and has a light absorption at a wavelength of 360
nm not less than 20%, thus the glass lens can have ultraviolet
absorption effect even at a low average thickness, thereby
protecting subsequent plastic lenses from ultraviolet
irradiation.
[0012] According to an embodiment of the present disclosure, the
material forming the glass lens is flint glass. Therefore, the
flint glass having a high refractive index can absorb most of the
ultraviolet rays and greatly reduces the transmittance of
ultraviolet rays, thereby protecting subsequent plastic lenses from
ultraviolet irradiation and improving UV resistance, with a better
protection effect.
[0013] According to an embodiment of the present disclosure, the
glass lens is capable of absorbing lights at a wavelength between
400 nm and 500 nm. Therefore, the glass lens can absorb part of
blue lights, thereby effectively avoiding blue-light irradiation to
subsequent plastic lenses, effectively prolonging the service life
of the glass-plastic hybrid lens assembly. Further, use of the
glass lens as described above is useful for achromatization, thus
simplifying the entire structure of the glass-plastic hybrid lens
assembly at a reduced cost.
[0014] According to an embodiment of the present disclosure, the
glass lens is a spherical glass lens or a flat glass lens.
Therefore, the spherical glass lens costs lower than a molded glass
lens and can be processed in an easier way, obtaining excellent
thermal stability; and the flat glass lens can effectively protect
the glass-plastic hybrid lens assembly. Further, coating a firm on
the surface of the spherical glass lens can be easily realized via
a simple process under reduced production difficulties.
[0015] The glass lens is not limited to a spherical or flat glass
lens within the cost range. Further, the aspheric glass lens can
also improve imaging quality, which can be used within the cost
range.
[0016] According to an embodiment of the present disclosure, the
glass-plastic hybrid lens assembly further comprises a waterproof
film, an anti-scratch film or a waterproof-anti-scratch film. The
waterproof film, the anti-scratch film or the
waterproof-anti-scratch film is disposed at a side of the glass
lens close to the object side and is disposed close to an object.
Therefore, effects of water-proofing, oil-proofing,
scratch-proofing or anti-static can be effectively achieved,
avoiding damage of the glass-plastic hybrid lens assembly under a
high humidity working environment, with greatly increased service
life.
[0017] According to an embodiment of the present disclosure, the
glass-plastic hybrid lens assembly further comprises a lens barrel.
The glass lens, the plastic lens and the ultraviolet cutoff layer
are all disposed in the lens barrel, and at least a portion of the
outer surface of the lens barrel is provided with an ultraviolet
reflective film or an ultraviolet absorbing film. Therefore, the
ultraviolet irradiation to the lens barrel can be effectively
avoided, thus effectively solving the problems of yellowing and
demolding of lens barrel occurring under strong ultraviolet
irradiation, with a prolonged service life for the lens barrel.
[0018] According to an embodiment of the present disclosure, the
glass-plastic hybrid lens assembly as described above is a
vehicle-mounted lens. Therefore, the vehicle-mounted lens as
described above can work efficiently within a wide temperature
range, achieve strong athermalization effect, and have excellent UV
resistance and great use performance. Meanwhile, the
vehicle-mounted lens as described above is also simple and costs
lower, which can be widely used in the vehicle-mounted system.
[0019] In another aspect of the present disclosure, provided in
embodiments of the present disclosure is a vehicle. According to an
embodiment of the present disclosure, the vehicle comprises the
glass-plastic hybrid lens assembly as described above. The present
inventors have found that the glass-plastic hybrid lens assembly in
the vehicle has a long service life and displays clear images and
excellent UV resistance, which can be operated within a wide
temperature range. Meanwhile, the glass-plastic hybrid lens
assembly costs lower, which can be widely used in the
vehicle-mounted system.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] FIG. 1 is a schematic diagram showing the structure of a
glass-plastic hybrid lens assembly according to an embodiment of
the present disclosure.
[0021] FIG. 2 is a schematic diagram showing the structure of a
glass-plastic hybrid lens assembly according to another embodiment
of the present disclosure.
[0022] FIG. 3 is a graph showing the light transmission at a
wavelength between 270 nm and 700 nm of a glass-plastic hybrid lens
assembly coated with an ultraviolet cutoff film on the surface
facing an object side and an anti-reflection film on the surface
facing an image side according to Example 1.
[0023] FIG. 4 is a graph showing the light reflectivity at a
wavelength between 380 nm and 780 nm of a glass-plastic hybrid lens
assembly coated with an ultraviolet cutoff film on the surface
facing an object side and an anti-reflection film on the surface
facing an image side according to Example 1.
[0024] FIG. 5 is a graph showing the light transmission at a
wavelength between 300 nm and 700 nm of a glass-plastic hybrid lens
assembly coated with an ultraviolet-infrared cut film on the
surface facing an object side and an anti-reflection film on the
surface facing an image side according to Example 2.
[0025] FIG. 6 is a graph showing the light transmission at a
wavelength between 300 nm and 1100 nm of a glass-plastic hybrid
lens assembly coated with an ultraviolet-infrared cut film on the
surface facing an object side and an anti-reflection film on the
surface facing an image side according to Example 2.
[0026] FIG. 7 is a schematic diagram showing the structure of a
glass-plastic hybrid lens assembly according to another embodiment
of the present disclosure.
[0027] FIG. 8 is a schematic diagram showing the structure of a
glass-plastic hybrid lens assembly according to another embodiment
of the present disclosure.
[0028] FIG. 9 is a graph showing the light transmission at a
wavelength between 250 nm and 1100 nm of a glass-plastic hybrid
lens assembly coated with an ultraviolet-infrared cut film on the
surface facing an object side and an anti-reflection film on the
surface facing an image side according to Example 9.
DETAILED DESCRIPTION
[0029] Embodiments of the present disclosure are described in
detail below. The embodiments described below are illustrative only
and are not to be construed as limiting the present disclosure. The
specific techniques or conditions which are not indicated in
examples are carried out according to the techniques or conditions
described in the literature in the art or according to the product
specification. The used reagents or instruments which are not
indicated by the manufacturer are all conventional products that
can be obtained commercially.
[0030] Most glass lenses have a refractive index which increases
with temperature, that is, a positive dn/dT representing the change
rate of refractive index of a material with temperature, thus the
optical back focal of a glass lens is reduced and the mechanical
back focus of the glass lens is increased due to the expansion of a
lens barrel at an increased temperature in a normal situation,
resulting in a very severe focus drift in high and low temperature
environment, thereby deteriorating imaging quality greatly. For
optical compensation, a common method is to combine the glass lens
with a plastic lens made of a plastic material having a negative
dn/dT, so as to compensate the change of the optical back focal and
the mechanical back focus, thereby achieving the purpose of
athermalization at a low cost. However, the plastic lens has
several prominent problems, such as poor thermal stability in high
and low temperature environment and poor UV resistance, which
affects the imaging quality severely. For solving the above
technical problems, the present inventors, after in-depth research,
have found that it is able to avoid the damage of plastic lenses
effectively by allowing the glass lens and the plastic lens
disposed from an object side to an image side in turn, and allowing
an ultraviolet cutoff layer disposed at a side of the plastic lens
away from the image side to absorb ultraviolet rays, thereby
preventing subsequent plastic lenses from ultraviolet
irradiation.
[0031] In view of these, in one aspect of the present disclosure,
provided in embodiments of the present disclosure is a
glass-plastic hybrid lens assembly. According to an embodiment of
the present disclosure, the glass-plastic hybrid lens assembly
comprises a glass lens and at least one plastic lens from an object
side to an image side of the glass-plastic hybrid lens assembly in
turn, and an ultraviolet cutoff layer, in which the ultraviolet
cutoff layer is disposed at a side of the plastic lens away from
the image side, and the ultraviolet cutoff layer is disposed spaced
from the plastic lens. It is found by the present inventors that
the glass-plastic hybrid lens assembly as described above is simple
and easy to be realized; the ultraviolet cutoff layer can
effectively absorb or reflect the ultraviolet irradiation on the
glass-plastic hybrid lens assembly, preventing subsequent plastic
lenses from ultraviolet irradiation effectively and solving
demoulding and yellowing phenomena of plastic lenses occurring
under strong UV irradiation effectively, thereby effectively
improving the UV resistance and solar-irradiance resistance of the
glass-plastic hybrid lens assembly. Further, the glass-plastic
hybrid lens assembly can effectively achieve athermalization by
combining a glass lens with a plastic lens at a low cost.
[0032] It should be noted that the ultraviolet cutoff layer as
described above can absorb or reflect ultraviolet rays, thereby
effectively preventing ultraviolet rays from passing through the
ultraviolet cutoff layer. According to the wavelength, ultraviolet
lights can be classified into near ultraviolet (UVA) (wavelength
ranging from 315 nm to 400 nm), far ultraviolet (UVB) (wavelength
ranging from 280 nm to 315 nm) and ultrashort ultraviolet (UVC)
(wavelength ranging from 100 nm to 280 nm). Among them, UVC has
been absorbed in the ozone layer, thus the ultraviolet cutoff of
the glass-plastic hybrid lens assembly according to the present
disclosure aims at the reflection or absorption of UVA or UVB.
[0033] According to an embodiment of the present disclosure, the
ultraviolet cutoff layer is disposed at a first surface of the
glass lens facing the object side or disposed at a second surface
of the glass lens facing the image side. Therefore, the structure
is simple and easy to be realized; the ultraviolet cutoff layer
exhibits strong adhesion when coated on the surface of the glass
lens and can effectively absorb the ultraviolet lights, avoiding
ultraviolet irradiation to the subsequent plastic lenses, with a
long service life. According to an embodiment of the present
disclosure, the ultraviolet cutoff layer is selected from an
ultraviolet cutoff film and an ultraviolet-infrared cutoff film.
Therefore, the ultraviolet cutoff film or the ultraviolet-infrared
cutoff film has a better effect on reflecting ultraviolet rays. The
ultraviolet-infrared cutoff film can also effectively reflect
infrared rays, improving the control to stray lights, and
effectively avoiding the generation of halos, with greater use
performance. According to an embodiment of the present disclosure,
the ultraviolet cutoff film highly cuts off waveband ranging from
280 nm to 400 nm, and is highly transparent to waveband ranging
from 410 nm to 1100 nm; and the ultraviolet-infrared cutoff film
highly cuts off waveband ranging from 280 nm to 400 nm and waveband
ranging from 700 nm to 1100 nm, and is highly transparent to
waveband ranging from 410 nm to 700 nm. It should be noted that the
cutoff as described above means that the ultraviolet light is
reflected by the ultraviolet cutoff film or the
ultraviolet-infrared cutoff film. According to an embodiment of the
present disclosure, the ultraviolet cutoff film or the
ultraviolet-infrared cutoff film can be formed via vapor deposition
and the like.
[0034] According to an embodiment of the present disclosure, the
ultraviolet cutoff film has a thickness of 1000 nm to 5000 nm, for
example the ultraviolet cutoff film may have a thickness of 1000
nm, 1500 nm, 2000 nm, 2500 nm, 2800 nm, 3100 nm, 3400 nm, 3700 nm,
4000 nm, 4300 nm, 4600 nm, 4800 nm, 5000 nm and the like; and the
ultraviolet-infrared cutoff film has a thickness of 3000 nm to 9000
nm, for example the ultraviolet-infrared cutoff film may have a
thickness of 3000 nm, 3500 nm, 4000 nm, 4500 nm, 5000 nm, 5500 nm,
6000 nm, 6500 nm, 7000 nm, 7500 nm, 8000 nm, 8500 nm, 9000 nm and
the like. Therefore, the ultraviolet cutoff film and the
ultraviolet-infrared cutoff film have a better effect on reflecting
ultraviolet rays or infrared rays, with greater use performance.
According to an embodiment of the present disclosure, materials
forming the ultraviolet cutoff film and the ultraviolet-infrared
cutoff film are a conventional material, which can be flexibly
selected according to actual needs.
[0035] According to an embodiment of the present disclosure, the
ultraviolet cutoff film or the ultraviolet-infrared cutoff film has
an anti-reflection effect on visible lights in order to increase
the transmittance of visible lights. Therefore, the ultraviolet
cutoff film can not only prevent ultraviolet radiation from
entering the glass-plastic hybrid lens assembly, but also
effectively increase the transmittance of visible lights, thereby
improving the imaging quality and prolonging the service life of
the glass-plastic hybrid lens assembly. It should be noted, the
anti-reflection effect on visible lights means that the ultraviolet
cutoff film or the ultraviolet-infrared cutoff film has an average
light transmittance at a wavelength of 450 nm to 650 nm of more
than 90%.
[0036] According to an embodiment of the present disclosure, the
glass-plastic hybrid lens assembly may further include an
anti-reflection film in order to further reduce reflection of
visible lights. The anti-reflection film is disposed at a first
surface of the glass lens facing the object side or disposed at a
second surface of the glass lens facing the image side, thereby
increasing the transmittance of visible lights, improving the
sharpness and contrast of lens imaging and obtaining high imaging
quality. In some preferred embodiments of the present disclosure,
the anti-reflection film is disposed at the surface of the glass
lens facing the object side. In some particular embodiments of the
present disclosure, one of the ultraviolet cutoff layer (such as,
an ultraviolet cutoff film, an ultraviolet-infrared cutoff film and
the like) and the anti-reflection film is disposed at the first
surface of the glass lens facing the object side, and the other of
the ultraviolet cutoff layer (such as, an ultraviolet cutoff film,
an ultraviolet-infrared cutoff film and the like) and the
anti-reflection film is disposed at the second surface of the glass
lens facing the image side. It should be noted, the glass lens as
described in the above embodiments may or may not have a function
of absorbing ultraviolet rays. Therefore, the preparation process
is convenient and at a low cost. The ultraviolet cutoff layer and
the anti-reflection film each can fully exert their respective
functions without mutual interference, thus increasing the
transmittance of visible lights, improving the sharpness and
contrast of lens imaging and obtaining high imaging quality.
According to an embodiment of the present disclosure, the
anti-reflection film may be formed via vapor deposition and the
like.
[0037] According to an embodiment of the present disclosure, the
anti-reflection film has a thickness of 100 nm to 800 nm, for
example the anti-reflection film may have a thickness of 100 nm,
150 nm, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 450 nm, 500 nm, 550
nm, 600 nm, 650 nm, 700 nm, 750 nm, 800 nm and the like. Therefore,
the transmittance of visible lights can be greatly improved and the
lens imaging exhibits better sharpness and contrast effects.
[0038] In some particular embodiments of the present disclosure,
the glass-plastic hybrid lens assembly includes a glass lens and at
least one plastic lens from an object side to an image side of the
glass-plastic hybrid lens assembly in turn, an ultraviolet cutoff
layer and an anti-reflection film, in which the ultraviolet cutoff
layer and the anti-reflection film are respectively disposed at two
corresponding surfaces of the glass lens, and the glass lens may or
may not have a function of cutting ultraviolet rays. Therefore, the
glass-plastic hybrid lens assembly is simple, easy to be realized
and prepared at a low cost. The glass-plastic hybrid lens assembly
also exhibits stronger ultraviolet cutoff effect, thereby
preventing subsequent plastic lenses from ultraviolet irradiation
effectively and avoiding demoulding or yellowing of plastic lenses,
with a long service life. Further, the ultraviolet cutoff layer and
the anti-reflection film each can fully exert their respective
functions without mutual interference.
[0039] In some embodiments of the present disclosure, the glass
lens is made of a glass material capable of absorbing ultraviolet
rays, and the glass lens is multiplexed into the ultraviolet cutoff
layer. Therefore, the glass lens simultaneously exhibits functions
of light transmission and ultraviolet absorption, thus lowering the
preparation cost, solving the glare problem occurring under the
sunlight for the obtained glass-plastic hybrid lens assembly, and
improving the imaging quality. It should be noted, the glass lens
multiplexed into the ultraviolet cutoff layer means that the glass
lens have functions of both lens imaging and absorbing ultraviolet
rays as well as preventing ultraviolet rays from passing through
the glass lens. Therefore, it is advantageous in the above
embodiments to simplify structure and reduce costs.
[0040] According to an embodiment of the present disclosure, the
light transmittance of a glass material absorbing ultraviolet rays
at waveband of 280 nm to 400 nm is indicated as T.sub.L, and the
light transmittance of a glass material absorbing ultraviolet rays
at waveband of 400 nm to 2400 nm is indicated as T.sub.H. For a
good ultraviolet absorption effect, T.sub.L and T.sub.H need
satisfy the following requirement: T.sub.L<15%; and
T.sub.H>90%. According to an embodiment of the present
disclosure, the material forming the glass lens may be flint glass
in order to meet the requirements of absorbing ultraviolet rays as
described above. The flint glass exhibits low light transmittance
for the lights within UVA and UVB spectrums, which can protect the
subsequent plastic lenses from ultraviolet irradiation, with strong
protection effect, thereby improving UV resistance and use
performance of the glass-plastic hybrid lens assembly. According to
an embodiment of the present disclosure, when multiplexed into the
ultraviolet cutoff layer, the glass lens may further include an
anti-reflection film in order to increase transmittance of visible
lights. The anti-reflection firm is disposed at a first surface of
the glass lens facing the object side or disposed at a second
surface of the glass lens facing the image side. Therefore, the
disposed anti-reflection film is capable of increasing the
transmittance of visible lights, improving the sharpness and
contrast of lens imaging and improving the imaging quality of the
glass-plastic hybrid lens assembly obtained.
[0041] According to an embodiment of the present disclosure, the
glass lens, in a yellow color, can also absorb lights at wavelength
of 400 nm to 500 nm. Such a glass lens can be made of a material of
H-ZF88, D-ZF93 and the like. Therefore, the glass lens can absorb
part of blue lights, effectively avoiding the irradiation of blue
lights to subsequent plastic lenses, thereby effectively prolonging
the service life of the glass-plastic hybrid lens assembly.
Further, use of the glass lens as described above is useful for
achromatization, thus simplifying the entire structure of the
glass-plastic hybrid lens assembly at a reduced cost.
[0042] According to an embodiment of the present disclosure, the
glass lens has an average thickness not less than 0.8 mm and has a
light absorption at a wavelength of 360 nm not less than 20%. Thus,
the glass lens can have ultraviolet absorption effect even at a low
average thickness, thereby protecting subsequent plastic lenses
from ultraviolet irradiation. It should be noted, the average
thickness of a glass lens refers to the average thickness of
section of the glass lens.
[0043] According to an embodiment of the present disclosure, the
glass lens is a spherical glass lens or a flat glass lens.
Therefore, the spherical glass lens exhibits small thermal
expansion and strong thermal stability, which is easy to be
processed and can be prepared by a simple process at a low cost.
The flat glass lens can effectively protect the glass-plastic
hybrid lens assembly. Further, coating a firm on the surface of the
spherical glass lens can be easily realized via a simple process
under reduced production difficulties.
[0044] According to an embodiment of the present disclosure, the
material forming the plastic lens is a conventional material. In
order to achieve athermalization, the at least one plastic lens may
be disposed at intervals or adjacently, which can be set according
to specific conditions in actual use. According to an embodiment of
the present disclosure, in order to achieve athermalization, the
material and shape of the glass lens and the plastic lens should be
adjusted to achieve a reasonable focal-power combination, such that
the glass lens and the plastic lens can cooperate with each other
under a large temperature change, that is, the refractive index
changes of the glass lens and the plastic lens can be compensated
by adjusting the material and shape of the glass lens and the
plastic lens because the glass lens and the plastic lens
respectively have a positively changed refractive index and a
negatively changed refractive index with the increase of
temperature, thus compensating the changes of optical back focal
and mechanical back focus, avoiding focus drift, and improving
imaging quality of the glass-plastic hybrid lens assembly.
[0045] It should be noted, only one glass lens included in the
glass-plastic hybrid lens assembly is illustrated in the above
embodiments, which cannot be construed as limiting the present
disclosure. During the actual production or practical use, in order
to achieve better athermalization, the glass-plastic hybrid lens
assembly can further comprise at least one glass material lens at a
side of the glass lens away from the object side, in which the
glass material lens can be a spherical glass lens.
[0046] According to an embodiment of the present disclosure, for a
better outdoor adaptability, the glass-plastic hybrid lens assembly
further comprises a waterproof film, an antiscratch film or a
waterproof-antiscratch film. The waterproof film, the antiscratch
film or the waterproof-antiscratch film is disposed at a side of
the glass lens close to the object side and is disposed close to an
object. Therefore, effects of water-proofing, oil-proofing,
scratch-proofing or anti-static can be effectively achieved,
avoiding damage of the glass-plastic hybrid lens assembly under a
high humidity working environment, with greatly increased service
life.
[0047] It should be noted, the waterproof film, the antiscratch
film or the waterproof-antiscratch film disposed close to an object
means the waterproof film, the antiscratch film or the
waterproof-antiscratch film is disposed at the outermost side of
the glass lens close to an object in specific applications.
According to an embodiment of the present disclosure, the material
forming the waterproof film, the antiscratch film or the
waterproof-antiscratch film is a conventional material, and the
thickness of the waterproof film, the antiscratch film or the
waterproof-antiscratch film can be flexibly selected according to
actual needs, which will not be described in details.
[0048] According to an embodiment of the present disclosure, the
glass-plastic hybrid lens assembly further comprises a lens barrel.
The glass lens, the plastic lens, and the ultraviolet cutoff layer
are all disposed in the lens barrel. At least a portion of the
outer surface of the lens barrel is provided with an ultraviolet
reflective film or an ultraviolet absorbing film. Therefore, the
ultraviolet irradiation to the lens barrel can be effectively
avoided, thus effectively solving the problems of yellowing and
demolding of lens barrel occurring under strong ultraviolet
irradiation, with prolonged service life for the lens barrel. It
should be noted, the glass lens is disposed at the side of the
plastic lens close to the object side. According to an embodiment
of the present disclosure, the material forming the ultraviolet
reflective film or the ultraviolet absorbing film is a conventional
material, which will not be described in details. The ultraviolet
reflective film or the ultraviolet absorbing film can have a
thickness of 1000 nm to 5000 nm, and the material forming the lens
barrel may be plastic and the like.
[0049] In some particular embodiments of the present disclosure,
referring to FIG. 1, in which Figure A1 shows a front view of the
glass-plastic hybrid lens assembly and Figure A2 shows a partial
enlarged view at position a in Figure A1, the glass-plastic hybrid
lens assembly comprises a lens barrel 200; a glass lens 110, a
first plastic lens 120 and a second plastic lens 130 from an object
side to an image side of the glass-plastic hybrid lens assembly in
turn, and the glass lens 110, the first plastic lens 120 and the
second plastic lens 130 are all disposed in the lens barrel 200; an
anti-reflection film 113, disposed at a surface of the glass lens
110 away from the object side; an ultraviolet cutoff film 112,
disposed at a surface of the glass lens 110 close to the object
side; and a waterproof film 111, disposed at a surface of the
ultraviolet cutoff film 112 close to the object side. In another
particular embodiment of the present disclosure, referring to FIG.
2, in which Figure B1 shows a front view of the glass-plastic
hybrid lens assembly and Figure B2 shows a partial enlarged view at
position b in Figure B1, the glass-plastic hybrid lens assembly
comprises a lens barrel 200; a glass lens 110, a first plastic lens
120 and a second plastic lens 130 from an object side to an image
side of the glass-plastic hybrid lens assembly in turn, in which
the glass lens 110, the first plastic lens 120 and the second
plastic lens 130 are all disposed in the lens barrel 200, and the
glass lens 110 is made of a glass material capable of absorbing
ultraviolet rays; an anti-reflection film 113, disposed at a first
surface of the glass lens 110 close to the object side and disposed
at a second surface of the glass lens 110 away from the object side
respectively; and a waterproof film 111, disposed at the surface of
the glass lens 110 close to the object side. The glass-plastic
hybrid lens assembly as described in the above embodiments is
simple, easy to be realized, has strong thermal stability and UV
resistance, and a long service life.
[0050] According to an embodiment of the present disclosure, the
glass-plastic hybrid lens assembly as described above may further
comprise a conventional structure, such as a diaphragm, a filter, a
flat glass and the like, which will not be described in detail.
[0051] According to an embodiment of the present disclosure, the
glass-plastic hybrid lens assembly as described above is a
vehicle-mounted lens. Therefore, the vehicle-mounted lens as
described above can work outdoors efficiently, and has improved
athermalization and excellent UV resistance, as well as great use
performance. The vehicle-mounted lens as described above is also
simple and prepared at a low cost, which can be widely used in the
vehicle-mounted system.
[0052] In another aspect of the present disclosure, provided in
embodiments of the present disclosure is a vehicle. According to an
embodiment of the present disclosure, the vehicle comprises the
glass-plastic hybrid lens assembly as described above. The present
inventors have found that the glass-plastic hybrid lens assembly in
the vehicle has a long service life and displays clear images and
excellent UV resistance, which can be operated within a wide
temperature range, for example from -40.degree. C. to 105.degree.
C. Meanwhile, the glass-plastic hybrid lens assembly in the vehicle
is prepared at a low cost, which can be widely used in the
vehicle-mounted system.
[0053] It should be noted, the installation position of the
glass-plastic hybrid lens assembly in the vehicle is same as the
conventional installation position, which will not be described in
details. Apart from the glass-plastic hybrid lens assembly as
described above, the vehicle further comprises those elements
equipped in a conventional vehicle, such as tires, a vehicle body,
an engine and the like, which will not be described in details.
[0054] According to the embodiments of the present disclosure, the
glass-plastic hybrid lens assembly of the present disclosure can
effectively absorb or reflect ultraviolet rays in lights, reduce
the damage of ultraviolet rays to subsequent plastic lenses and
improve the service life, thermal stability and UV resistance of
the glass-plastic hybrid lens assembly by allowing arrangement of
an ultraviolet cutoff layer at the side of the plastic lens away
from the image side, compared to existing lens assembly with the
glass lens and the plastic lens which shows easy damage of lens
barrel or plastic lens under ultraviolet irradiation, poor thermal
stability and a decreased imaging quality. Further, coating an
ultraviolet reflective film on the outer surface of the lens barrel
can effectively solve problems of yellowing and demoulding of lens
barrel occurring under strong ultraviolet irradiation, thus
improving the UV resistance and solar-radiation resistance of the
entire lens.
EXAMPLES
Example 1
[0055] The specific structure of the glass-plastic hybrid lens
assembly in this example can be referred to FIG. 1. The
glass-plastic hybrid lens assembly comprises a lens barrel 200, on
which out surface is coated with an ultraviolet reflective film
having a thickness of 1000 nm to 5000 nm; a glass lens 110, a first
plastic lens 120 and a second plastic lens 130 from an object side
to an image side of the glass-plastic hybrid lens assembly in turn,
in which the glass lens 110, the first plastic lens 120 and the
second plastic lens 130 are disposed in the lens barrel 200 and the
glass lens 110 is a spherical glass lens; an anti-reflection film
113, disposed at the surface of the glass lens 110 close to the
image side and having a thickness of 324 nm; an ultraviolet cutoff
film 112, disposed at the surface of the glass lens 110 close to
the object side and having a thickness of 1259 nm; and a waterproof
film 111, disposed at the surface of the ultraviolet cutoff film
112 close to the object side.
[0056] As shown in the light transmittance curve of FIG. 3, the
glass-plastic hybrid lens assembly provided in this example has a
light transmittance at visible-light band of 400 nm to 700 nm of
96% above, and has a light transmittance at ultraviolet band of 280
nm to 400 nm of 0.5% below. As shown in the reflectance curve of
FIG. 4, the glass-plastic hybrid lens assembly provided in this
example has a reflectivity to visible lights of less than 0.3%.
[0057] The glass-plastic hybrid lens assembly provided in this
example can effectively reduce cost and has excellent thermal
stability due to the reasonable combination of the glass lens and
the plastic lens; is capable of effectively avoiding the
ultraviolet irradiation to subsequent plastic lenses due to the
ultraviolet cutoff film coated at the surface of the glass lens,
thereby effectively solving the demoulding and yellowing phenomena
of plastic lens even plastic lens barrel occurring under strong
ultraviolet irradiation, such that the glass-plastic hybrid lens
assembly has excellent UV resistance. Further, spherical glass
lenses are used in the present disclosure, with features not only
small thermal expansion and good thermal stability owned by itself
but also realizing athermalization in a high and low temperature
environment, coating film on which surface also exhibits good
effect. Furthermore, the waterproof film can protect the
glass-plastic hybrid lens assembly, by which the service life of
the lens assembly is greatly increased.
Example 2
[0058] The glass-plastic hybrid lens assembly in this example is
substantially same as that in Example 1, except that an
ultraviolet-infrared cutoff film (UV-IR Cut) having a thickness of
5490 nm is disposed at the surface of the glass lens close to the
image side, and an anti-reflection film having a thickness of 324
nm is disposed at the surface of the glass lens close to the object
side.
[0059] Coating the ultraviolet-infrared cutoff film at the surface
of the glass lens close to the image side can not only absorb
ultraviolet rays but also improve the control to stray lights, with
cut-off at the near-infrared light. As shown in the transmittance
curves of FIG. 5 and FIG. 6, the glass-plastic hybrid lens assembly
provided in this example has light transmittance at visible-light
waveband from 410 nm to 700 nm of 96% above, has light
transmittance at ultraviolet waveband from 300 nm to 410 nm of 0.5%
below, and shows nearly transmittance cut-off to the near-infrared
light.
[0060] The glass-plastic hybrid lens assembly provided in this
example can effectively reduce the cost and has good thermal
stability due to the reasonable combination of the glass lens and
the plastic lens. The ultraviolet-infrared cutoff film coated at
the surface of the glass lens can effectively block the ultraviolet
irradiation to subsequent plastic lenses, thereby effectively
solving the demoulding and yellowing phenomena of plastic lens even
plastic lens barrel occurring under strong ultraviolet irradiation,
thus the glass-plastic hybrid lens assembly exhibits excellent
ultraviolet resistance.
Example 3
[0061] The specific structure of the glass-plastic hybrid lens
assembly provided in this example can be referred to FIG. 7.
[0062] The glass-plastic hybrid lens assembly comprises a glass
lens 110, a diaphragm 160, a first plastic lens 120, a second
plastic lens 130, a filter 140 and a flat glass 150 from an object
side to an image side of the glass-plastic hybrid lens assembly in
turn. The glass lens is a spherical glass lens. The first plastic
lens and the second plastic lens each are an aspheric lens, and
each aspheric surface of the first plastic lens and the second
plastic lens meets the following formula:
z = ch 2 1 + 1 - ( 1 + k ) c 2 h 2 + Bh 4 + Ch 6 + Dh 8 + Eh 10 +
Fh 12 + Gh 14 + Hh 16 , ##EQU00001##
[0063] in which, represents a distance between a surface and a
tangent plane of a vertex of the surface in a direction of the
optical axis, c represents a curvature of the vertex of the
surface, k represents a 2.sup.nd order correction coefficient, h
represents a height from the surface to the optical axis, and B, C,
D, E, F, G and H represent 4.sup.th, 6.sup.th, 8.sup.th, 10.sup.th,
12.sup.th, 14.sup.th and 16.sup.th order correction coefficients,
respectively.
[0064] The glass material selected for the glass lens 110 has an
ultraviolet absorbing function, specifically dense barium flint
glass having a refractive index of 1.72, with a code of H-ZBaF21.
The relevant parameters of respective lenses of the glass-plastic
hybrid lens assembly in this example are shown in Table 1.
TABLE-US-00001 TABLE 1 Sur- Re- face Surface Curvature Thick-
fractive Abbe No. type radius ness index number S1 Glass lens
Spherical 1.4899 1.620 1.72 38.0 S2 Spherical 3.9995 0.0515 S3
Diaphragm Spherical -- 0.4206 S4 First plastic Aspheric -1.3128
0.2376 1.64 23.5 S5 lens Aspheric -3.3130 0.1816 S6 Second Aspheric
0.8963 0.7535 1.54 56.0 S7 plastic lens Aspheric 1.5525 0.15 S8
Filter Spherical -- 0.21 1.517 64.21 S9 Spherical -- 0.3 S10 Flat
glass Spherical -- 0.40 1.517 64.21 S11 Spherical -- 0.0116
[0065] The aspheric parameters of the first plastic lens and the
second plastic lens in this example are shown in Table 2.
TABLE-US-00002 TABLE 2 Surface No. k B C D E F G H S4 -2.16531E+01
-1.88651E+00 6.60306E+00 -7.23126E+00 -5.92606E+01 3.65598E+02
-7.95655E+02 6.11173E+02 S5 1.24771E+01 -2.04276E+00 8.55440E+00
-2.72939E+01 6.71299E+01 -9.47710E+01 6.87957E+01 -2.07943E+01 S6
-7.80560E+00 -4.61797E-01 6.98024E-01 -5.72985E-01 2.86625E-01
-8.25662E-02 1.15584E-02 -4.99862E-04 S7 -7.10281E-01 -2.30047E-01
-4.86494E-02 1.98532E-01 -1.63085E-01 6.57780E-02 -1.32431E-02
1.04172E-03
Example 4
[0066] The glass-plastic hybrid lens assembly in this example is
same as that in Example 3, except for a different material of the
glass lens 110. Specifically, the glass material selected for the
glass lens 110 in this example has an ultraviolet absorbing
function, particularly dense flint glass having a refractive index
of 1.76, with a code of H-ZF12.
[0067] The relevant parameters of respective lenses of the
glass-plastic hybrid lens assembly in this example are shown in
Table 3.
TABLE-US-00003 TABLE 3 Sur- Re- face Surface Curvature Thick-
fractive Abbe No. type radius ness index number S1 Glass lens
Spherical 1.5585 0.830 1.76 26.6 S2 Spherical 3.6058 0.0352 S3
Diaphragm Spherical -- 0.4443 S4 First plastic Aspheric -1.1886
0.2376 1.64 22.4 S5 lens Aspheric -2.4591 0.1840 S6 Second Aspheric
0.8836 0.8144 1.54 56.0 S7 plastic lens Aspheric 1.5878 0.15 S8
Filter Spherical -- 0.21 1.517 64.21 S9 Spherical -- 0.3 S10 Flat
glass Spherical -- 0.40 1.517 64.21 S11 Spherical -- 0.0250
[0068] The aspheric parameters of the first plastic lens and the
second plastic lens in this example are shown in Table 4.
TABLE-US-00004 TABLE 4 Surface No. k B C D E F G H S4 -19.27848
-1.8259308 5.855837 -10.351692 -41.177431 431.97692 -1239.3129
1198.1174 S5 -3.677469 -1.9899842 8.2676727 -30.240075 81.532543
-118.04768 77.193508 -13.314512 S6 -8.495849 -0.34278699 0.60395028
-0.54303991 0.29555177 -0.09153089 0.012084941 -5.1896807e-5 S7
-0.5993519 -0.2713965 0.079296303 0.049342204 -0.084578096
0.052660634 -0.016114871 0.0018930533
Example 5
[0069] The glass-plastic hybrid lens assembly in this example is
same as that in Example 3, except for a different material of the
glass lens 110. Specifically, the glass material selected for the
glass lens 110 in this example has an ultraviolet absorbing
function, particularly lanthanum flint glass having a refractive
index of 1.75, with a code of H-LaF4.
[0070] The relevant parameters of respective lenses of the
glass-plastic hybrid lens assembly in this example are shown in
Table 5.
TABLE-US-00005 TABLE 5 Sur- Re- face Surface Curvature Thick-
fractive Abbe No. type radius ness index number S1 Glass lens
Spherical 1.5300 1.125 1.75 35.0 S2 Spherical 3.8373 0.0527 S3
Diaphragm Spherical -- 0.4477 S4 First plastic Aspheric -1.2684
0.2376 1.64 23.5 S5 lens Aspheric -3.0930 0.1640 S6 Second Aspheric
0.8960 0.7677 1.54 56.0 S7 plastic lens Aspheric 1.6452 0.10 S8
Filter Spherical -- 0.21 1.517 64.21 S9 Spherical -- 0.3 S10 Flat
glass Spherical -- 0.40 1.517 64.21 S11 Spherical -- 0.05
[0071] The aspheric parameters of the first plastic lens and the
second plastic lens in this example are shown in Table 6.
TABLE-US-00006 TABLE 6 Surface No. k B C D E F G H S4 -29.009
-1.9408512 6.435917 -7.3820308 -58.675887 368.24467 -797.59804
607.9106 S5 10.23218 -1.9789931 8.2798476 -27.635222 68.356764
-95.369484 69.341942 -21.624713 S6 -9.137253 -0.41858722 0.66594924
-0.56507767 0.28762651 -0.082866959 0.011239109 -0.00040886445 S7
-0.2451062 -0.23026937 -0.043287576 0.19248169 -0.1621205
0.065392819 -0.013061426 0.001006205
Example 6
[0072] The schematic structure of the glass-plastic hybrid lens
assembly provided in this example can be referred to FIG. 8. The
glass-plastic hybrid lens assembly in this example comprises six
lenses. Specifically, the glass-plastic hybrid lens assembly
comprises a first glass lens 110 (made of a UV-absorbing glass
material), a first plastic lens 120, a second glass lens 170, a
diaphragm 160, a second plastic lens 130, a third plastic lens 180,
a fourth plastic lens 190, a filter 140 and a flat glass 150 from
an object side to an image side of the glass-plastic hybrid lens
assembly in turn. The first glass lens 110 and the second glass
lens 170 each are a spherical glass lens. The first plastic lens
120, the second plastic lens 130, the third plastic lens 180 and
the fourth plastic lens 190 each are an aspheric plastic lens. The
glass material selected for the glass lens 110 has an ultraviolet
absorbing function, particularly dense lanthanum flint glass having
a refractive index of 1.91, with a code of H-ZLaF4LA. The relevant
parameters of respective lenses of the glass-plastic hybrid lens
assembly in this example are shown in Table 7.
TABLE-US-00007 TABLE 7 Sur- Re- face Surface Curvature Thick-
fractive Abbe No. type radius ness index number S1 First glass
Spherical 11.986 1.280 1.91 35.3 S2 lens Spherical 3.042 2.734 S3
First Aspheric -40.100 1.082 1.54 56.0 S4 plastic Aspheric 1.604
0.956 lens S5 Second Spherical 5.718 3.236 1.91 35.3 S6 glass lens
Spherical -5.718 1.594 S7 Diaphragm -- 0.274 S8 Second Aspheric
3.094 1.211 1.54 56.0 S9 plastic Aspheric -1.724 0.088 lens S10
Third Aspheric -2.624 0.626 1.64 23.5 S11 plastic Aspheric 2.082
0.353 lens S12 Fourth Aspheric 3.384 2.015 1.54 56.0 S13 plastic
Aspheric -2.463 0.30 lens S14 Filter Spherical -- 0.30 1.517 64.21
S15 Spherical -- 0.70 S16 Flat glass Spherical -- 0.40 1.517 64.21
S17 Spherical -- 0.20
[0073] The aspheric parameters of the first plastic lens, the
second plastic lens, the third plastic lens and the fourth plastic
lens in this example are shown in Table 8.
TABLE-US-00008 TABLE 8 Surface No. K B C D E F G H S3 200.00 -0.017
2.390e-3 -1.821e-4 5.258e-6 1.676e-7 0 0 S4 -0.684 -0.029 4.171e-3
-4.090e-4 -1.021e-5 -2.505e-6 0 0 S8 3.619 -0.019 0.011 -0.042
0.032 -0.01 0 0 S9 -1.359 0.011 0.034 -0.040 8.678e-3 1.470e-3 0 0
S10 -0.381 -0.091 0.151 -0.113 0.034 -1.020e-3 0 0 S11 -6.468
-0.019 0.047 -0.026 6.275e-3 -5.376e-4 0 0 S12 0.749 -4.818e-3
-6.430e-3 4.163e-3 -1.100e-3 1.041e-4 0 0 S13 -5.868 -0.017
8.221e-3 -3.472e-3 9.093e-4 -8.261e-5 0 0
[0074] The light transmittance of the glass lens in the
glass-plastic hybrid lens assembly in Examples 3-6 is shown in
Table 9.
TABLE-US-00009 TABLE 9 Wavelength Light transmittance of glass lens
(nm) Example 3 Example 4 Example 5 Example 6 2400 0.978 0.992 0.981
0.979 2200 0.999 0.994 0.991 0.994 2000 0.996 0.997 0.997 0.997
1800 0.998 0.999 0.998 0.999 1600 0.999 0.999 0.999 0.999 1400
0.999 0.999 0.999 0.999 1200 0.999 0.999 0.999 0.999 1060 0.999
0.999 0.999 0.999 1000 0.999 0.999 0.999 0.999 950 0.999 0.999
0.999 0.999 900 0.999 0.999 0.999 0.999 850 0.999 0.999 0.999 0.999
800 0.999 0.999 0.999 0.999 700 0.999 0.999 0.999 0.999 650 0.999
0.999 0.999 0.999 600 0.999 0.999 0.999 0.999 550 0.999 0.999 0.999
0.998 500 0.998 0.999 0.999 0.997 480 0.997 0.998 0.998 0.995 460
0.996 0.998 0.997 0.994 440 0.995 0.997 0.996 0.990 420 0.993 0.994
0.994 0.986 400 0.988 0.984 0.988 0.975 390 0.980 0.968 0.981 0.964
380 0.963 0.924 0.964 0.942 370 0.772 0.800 0.920 0.899 360 0.800
-- 0.800 0.800 350 0.530 -- -- -- 340 -- -- -- -- 330 -- -- -- --
320 -- -- -- -- 310 -- -- -- -- 300 -- -- -- -- 290 -- -- -- -- 280
-- -- -- -- Note: "--" means that light transmittance of material
is zero at the wavelength corresponding to "--"
[0075] It can be seen from Table 9 that each lens in Examples 3-6
has a cooperated refractive index and Abbe number, thus effectively
achieving athermalization, such that the glass-plastic hybrid lens
assembly has high imaging quality, and has a prolonged service life
due to the effective prevention of ultraviolet irradiation to
subsequent plastic lenses. The minimum average thickness and the
light transmittance of the glass lens meet that the glass lens has
an average thickness of at least 0.8 mm when its light
transmittance at a wavelength of 360 nm is 20% above.
Example 7
[0076] The glass-plastic hybrid lens assembly in this example is
same as that in Example 3, except for a different material of the
glass lens 110. Specifically, the glass material selected for the
glass lens 110 in this example has a function of absorbing
ultraviolet rays and partial blue lights, particularly dense flint
glass having a refractive index of 1.95, with a code of H-ZF88.
This glass material having extremely-high refractive index and high
dispersion brings great freedom to the optical design.
[0077] The relevant parameters of respective lenses of the
glass-plastic hybrid lens assembly in this example are shown in
Table 10.
TABLE-US-00010 TABLE 10 Sur- Re- face Surface Curvature Thick-
fractive Abbe No. type radius ness index number S1 Glass lens
Spherical 1.4952 0.6405 1.95 17.9 S2 Spherical 1.8617 0.0484 S3
Diaphragm Spherical -- 0.3115 S4 First Aspheric -2.0361 0.497 1.64
23.1 S5 plastic lens Aspheric -46.4910 0.1189 S6 Second Aspheric
0.8476 1.0113 1.54 56.0 S7 plastic lens Aspheric 3.9102 0.1500 S8
Filter Spherical -- 0.21 1.517 64.21 S9 Spherical -- 0.3 S10 Flat
glass Spherical -- 0.40 1.517 64.21 S11 Spherical -- 0.06
[0078] The aspheric parameters of the first plastic lens and the
second plastic lens in this example are shown in Table 11.
TABLE-US-00011 TABLE 11 Surface No. k B C D E F G H S4 -114.7691
-2.0294 11.2502 -50.8716 90.3321 359.5615 -1877.9676 2294.3660 S5
4167.4749 -2.5439 11.7602 -42.6445 96.5322 -93.5328 -14.7969
60.5994 S6 -11.1779 -0.2221 0.5128 -0.5096 0.3000 -0.1029 0.0178
-1.059e-3 S7 4.0984 -0.0310 -0.1294 0.1185 -0.0793 0.0483 -0.0175
2.4247e-3
Example 8
[0079] The glass-plastic hybrid lens assembly in this example is
same as that in Example 3, except for a different material of the
glass lens 110. Specifically, the glass material selected for the
glass lens 110 in this example has a function of absorbing
ultraviolet rays and partial blue lights, particularly dense flint
glass having a refractive index of 2.00, with a code of D-ZF93.
This glass material having extremely-high refractive index and high
dispersion brings great freedom to the optical design.
[0080] The relevant parameters of respective lenses of the
glass-plastic hybrid lens assembly in this example are shown in
Table 12.
TABLE-US-00012 TABLE 12 Sur- Re- face Surface Curvature Thick-
fractive Abbe No. type radius ness index number S1 Glass lens
Spherical 1.5238 0.6363 2.00 20.7 S2 Spherical 1.9184 0.0491 S3
Diaphragm Spherical -- 0.3056 S4 First Aspheric -2.0192 0.2493 1.64
23.1 S5 plastic lens Aspheric -30.2148 0.1145 S6 Second Aspheric
0.8817 1.0490 1.54 56.0 S7 plastic lens Aspheric 4.0312 0.15 S8
Filter Spherical -- 0.21 1.517 64.21 S9 Spherical -- 0.3 S10 Flat
glass Spherical -- 0.40 1.517 64.21 S11 Spherical -- 0.04
[0081] The aspheric parameters of the first plastic lens and the
second plastic lens in this example are shown in Table 13.
TABLE-US-00013 TABLE 13 Surface No. k B C D E F G H S4 -83.4822
-1.7447 8.8090 -36.6262 57.6981 328.6302 -1593.3409 1904.9950 S5
1729.5697 -2.4380 11.5839 -41.8529 95.4685 -92.4590 -17.4667
62.8075 S6 -12.3346 -0.2167 0.5188 -0.5243 0.3044 -0.0986 0.0146
-4.734e-4 S7 3.8100 -0.0314 -0.1141 0.1075 -0.0795 0.0491 -0.0173
2.3031e-3
[0082] The light transmittance listing of the glass material
selected for the glass lens of the glass-plastic hybrid lens
assembly in Examples 7 and 8 can be referred to Table 14.
TABLE-US-00014 TABLE 14 Light transmittance of glass lens (Sample
thickness: 5 mm) Wavelength (nm) Example 7 Example 8 2400 0.973
0.854 2200 0.983 0.947 2000 0.993 0.981 1800 0.996 0.992 1600 0.998
0.997 1400 0.999 0.998 1200 0.999 0.999 1060 0.999 0.999 1000 0.999
0.998 950 0.998 0.998 900 0.998 0.998 850 0.997 0.997 800 0.997
0.995 700 0.996 0.994 650 0.995 0.993 600 0.994 0.993 550 0.989
0.988 500 0.973 0.958 480 0.960 0.927 460 0.941 0.869 440 0.908
0.758 420 0.837 0.530 400 0.486 0.134 390 0.158 -- 380 -- -- 370 --
-- 360 -- -- 350 -- -- 340 -- -- 330 -- -- 320 -- -- 310 -- -- 300
-- -- 290 -- -- 280 -- -- Note: "--" means that light transmittance
of material is zero at the wavelength corresponding to "--"
[0083] Each lens in Examples 7 and 8 has a cooperated refractive
index and Abbe number, thus effectively achieving athermalization,
such that the glass-plastic hybrid lens assembly has high imaging
quality, and has an effectively prolonged service life because the
glass lens having a function of absorbing ultraviolet rays and
partial blue lights can effectively prevent ultraviolet irradiation
to subsequent plastic lenses and reduce damage of blue lights to
the subsequent plastic lenses.
Example 9
[0084] The glass-plastic hybrid lens assembly in this example is
same as that in Example 3, except that an ultraviolet-infrared
cutoff film is disposed at the surface of the glass lens facing the
object side, an anti-reflection film is disposed at the surface of
the glass lens facing the image side, a waterproof film is disposed
at the surface of the ultraviolet-infrared cutoff film close to the
object side, and the glass lens has a function of absorbing
ultraviolet rays, particularly dense flint glass, with a code of
H-ZF12.
[0085] As shown in the transmittance curves of FIG. 9, the
glass-plastic hybrid lens assembly provided in this example has
light transmittance at visible-light waveband from 410 nm to700 nm
of 96% above, and shows nearly transmittance cut-off to both the
ultraviolet waveband from 250 nm to 400 nm and the near-infrared
waveband from 700 nm to 1100 nm.
[0086] According to the description of the present disclosure, it
is to be understood that the terms "first" and "second" are used
for descriptive purposes only, which are not to be construed as
indicating or implying a relative importance or implicitly
indicating the number of indicated technical features. Thus, the
features defining "first" and "second" may explicitly or implicitly
include one or more of the features. According to the description
of the present disclosure, the term "a plurality of" means two or
more than two, unless specifically defined otherwise.
[0087] According to the description of the present specification,
the description with reference to the terms "one embodiment", "some
embodiments", "an example", "a specific example" or "some examples"
and the like means specific features, structures, materials or
characteristics described in connection with the embodiment or
example are included in at least one embodiment or example of the
present disclosure. In the present specification, the schematic
representation of the above terms is not necessarily directed to
the same embodiment or example. Further, the specific features,
structures, materials, or characteristics described may be combined
in any one or a plurality of embodiments or examples in a suitable
manner. In addition, various embodiments or examples as well as
features of various embodiments or examples described in the
specification may be combined by skilled in the art without
inconsistency.
[0088] Although the embodiments of the present disclosure have been
shown and described, it is understood that the embodiments as
described above are illustrative and are not to be construed as
limiting the present disclosure. The embodiments are subject to
variations, modifications, substitutions and variations. Changes,
modifications, alterations and variations of the embodiments as
described above can be made by skilled in the art within the scope
of the present disclosure.
* * * * *